2011 Mazda CX-9: brake failure

Filed Oct 3, 2022 · Brakes · OH

Braking trouble recent in weeks in 2011 Mazda CX-9 vehicle. Had mechanic (Euro Motorsports in Chagrin Falls OH) check it out. Turned out to be a faulty Brake Booster. Mechanic test drove car; braking failed and he almost rear-ended another vehicle. He found on line a Mazda service notice dating from April 4, 2014 called SSP93. Mazda issued an extended warranty of 7 years or 90,000 miles, whichever came first, to have defective part replaced by an improved part. But we were never informed by Mazda of Bedford, where we bought the vehicle. Currently, our vehicle has about 83,000 miles. Never knew there was a problem until recent trouble with the braking. There are thousands of CX-5, Cx-7, and Cx-9 vehicles in operation in U.S. right now; probably many owners have no idea there is a brake defect in their vehicles that could cause a serious accident, potentially fatal. Mazda should have done a recall in 2014, not an extended warranty. Although Brake Boosters are supposedly good for at least 150,000 miles of driving, our brake failure at around 83,000 miles proves otherwise. the federal safety agency should order Mazda to recall all vehicles with the defective brake part and replace them at Mazda's expense, probably hundreds of dollars each time. We do not want to have our brake booster replaced by our regular Euro Motosports mechanics because a recall must typically be repaired by the dealer. We already filed a complaint with State of Ohio Attorney General's office, but their people say the complaint must first go through BBB. No urgency on their part at all, even when informed potentially fatal flaw in the brakes. To avoid dangerous accidents, the federal safety agency should act more swiftly. Thanks.

Filed Sep 30, 2019 · Brakes · 103,000 miles · IN

Our vehicle has lost braking power and is unsafe to drive any distance now. It is very difficult to get the vehicle to stop and keep it stopped once it has stopped moving without putting it in park. I have been advised this is in relation to mazda ssp 93. Mazda has advised that is it my responsibility to have this vehicle towed to the nearest dealership, pay for repair labor, and pay for a rental car while repairs are being made. I am in complete disbelief that a known manufacturer's defect related to braking and general safety of everyone on the road was not immediately issued as a recall. We were provided zero notice that there was even potential for brake failure.

Filed Aug 4, 2018 · Brakes · 133,000 miles · DE

Brake peddle stiff, makes hissing noise. At times while in traffic loss of braking ability happens.

Filed Jul 6, 2018 · Brakes · 125,707 miles · TX

Current mileage: 125707. Noted brake fade, insufficient braking response during normal city driving. The vehicle was towed to a location to have the brakes examined. New front rotors, calipers and brake pads were installed. Brake system bled and vehicle test driven. Normal braking during speed tests of city driving and emergency braking. Vehicle then driven for 2-3 days of normal operation. Operator driving the vehicle and when braking to a stop on approach to an intersection noted the brake pedal went to the floor before vehicle would slow. The pedal had to be pumped to obtain a measure of brake response. The vehicle took longer to slow to a stop. Also noted during braking was a "hissing" noise when depressing the pedal. Pedal was then pumped up on approach to any anticipated stopping point. Vehicle taken to be checked for possible air in the brake lines. Brake system checked for air in the brake lines and none found. Taken to a third-party shop for analysis. It was determined that the mazda oem power brake booster had failed and per the mechanic (note attached pdf) the diaphragm had become "brittle" and the brake power booster failure caused the "hissing" noises and the brakes to be causing the brakes to become unresponsive. The oem brake booster had to be replaced. During a review of online information it was discovered that the federal safety agency had conducted an investigation into the issue of master brake cylinder leakage regarding this generation of mazda brake boosters. The vehicle has been in to a mazda dealership for prior recall replacement of other defects, however this potential defect was not addressed.

Filed May 17, 2018 · Brakes · 120,000 miles · TX

Tl* the contact owns a 2011 mazda cx-9. While driving at an unknown speed, the brakes failed to respond when the brake pedal was depressed. There were no warning indicators illuminated during the failure. The dealer was not contacted. The vehicle was taken to an independent mechanic where it was diagnosed that the brake booster failed. The vehicle was repaired. The manufacturer was notified of the failure. The VIN was unknown. The failure mileage was 120,000.

Filed Jul 22, 2017 · Brakes · 75,400 miles · CA

Stiff pedal. No brakes

Filed Jun 21, 2017 · Brakes · 90,000 miles · CA

Tl* the contact owns a 2011 mazda cx-9. While driving approximately 30 to 40 MPH, the contact engaged the brake pedal and attempted make a left turn, but the brakes failed to engage. The contact was able to steer the vehicle onto a dirt road to bring the vehicle to a stop. The vehicle was towed to the hyundai mazda dealer (14821 pandelli road victorville, ca 92392 phone 760‑241‑3801) where it was diagnosed that the brake booster failed. The manufacturer stated that the brake booster failure was not warranted for 90,000 miles. The vehicle was not repaired. The failure mileage was 90,000.

Filed Mar 7, 2017 · Brakes · 93,000 miles · MA

While driving in the city or on highway suddenly the brake pedal becomes hard to press and creeps down to floor with loss of brake booster, a hissing noise is heard in the car and it becomes very hard to stop the vehicle

Filed Aug 16, 2016 · Brakes · 130,000 miles · TX

Reference ssp93 - brake booster diaphragm leakage on 2010-2012 mazda cx-9 vehicles. On, or about august 5, 2016 power brakes failed, causing a need to apply heavier than normal pedal pressure to stop vehicle, resulting in very near rear-end collision with vehicle at stop sign. This defect is known by the manufacturer and was investigated by the federal safety agency in 2014. Investigation was closed with no recall action recommended. There should indeed be a recall mandated for this defect since it can result in serious collisions due to failure to safely stop vehicle.

Filed Jul 17, 2016 · Brakes · 59,000 miles · NC

Loss of brake fluid; brake pedal hard to push & not stopping car; noise at brake pedal

Filed Jun 16, 2016 · Brakes · 1 miles · CA

There is an issue when using the brakes where there's a loss of power assist making the brakes really hard to push at times, a sudden loss of braking ability with super spongy pedals, and a strange, hissing noise coming from the pedal area. These issues happen concurrently when driving in the city or highway and whenever the car is in reverse or drive.

Filed Jun 1, 2015 · Brakes · 100,200 miles · NV

I had 3 children in car seats, myself and my oldest son in our cx9. I crested a hill and started down the other side and I applied the brakes to slow down and they were hard and would not allow me to stop. I almost hit the truck in front of me. He was thankfully watching his mirror and ran a red light to get out of the way so I didn't hit him. After standing on the brakes for what seemed like a life time they finally engaged in the middle of the intersection and hissed with a loud squealing noise. I removed myself from the intersection and at 5 miles per hour went to the nearest mechanic. I was told to call mazda because the power assist braking system had failed. I called mazda and they told me not drive it as it was unsafe. They would have it towed to the nearest dealership and would take care of it. The nearest dealership is dolan mazda kia in reno nevada. I was informed by steve to look at it in the shop I was looking at $125. And that it was no longer under warranty because my cx9 has over a 100k mls. And the warranty ran out at 90k. The brakes failed unexpectedly with no warning. I was never notified about this safety issue from mazda nor the dealership I purchased it from. I see that the federal safety agency has closed it's investigation with no recall or that mazda customers were informed. My family could have been seriously injured or even killed.